할어버지를 영어로 뭐엇이라고 합니까?
할어버지를 영어로 뭐엇이라고 합합니까?

Extra: Also would it be better for me to ask what words are by saying (할어버지를) 영어로 뭐엇이라 고 합니까? Or in this way of asking would the word take a different particle? Im thinking maybe 이/가 making it the subject of the sentence.

Question

할어버지를 영어로 뭐엇이라고 합니까?
할어버지를 영어로 뭐엇이라고 합합니까?

Extra: Also would it be better for me to ask what words are by saying  (할어버지를) 영어로 뭐엇이라 고 합니까? Or in this way of asking would the word take a different particle? Im thinking maybe 이/가 making it the subject of the sentence.

Answer

할어버지를 영어로 뭐엇이라고 합합니까? 

할아버지를 영어로 무엇이라고 합니까? 

할아버지 -> grandfather 

할머니 -> grandmother 

* 은/는/이/가 make the subject of the sentence.

Answer

It would be a bit easier to understand if it starts off with 영어로.

영어로 할아버지를 무엇이라고 합니까?
In English, what do you say when you refer to "할아버지"?

할아버지가 영어로 무엇이라고 합니까? sounds like "What does the grandfather say in English"?

이/가 has the subject and the action interconnected together while 은/는 doesn't.